Blade with 7mm height x 6mm wide segment for easy removal of mortar from joints without damaging brick, block or masonry. Max 13,200rpm. Compatible with 22.23mm bore angle grinders including Silverline & GMC. Blade with 7mm height x 6mm wide segment for easy removal of mortar from joints without damaging brick, block or masonry. Max 13,200rpm. Compatible with 22.23mm bore angle grinders including Silverline & GMC.